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A Data Model for XML Databases

机译：XML数据库的数据模型

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In the proposed data model for XML databases, an XML element is directly represented as a ground (variable-free) XML expression―a generalization of an XML element by incorporation of variables for representation of implicit information and enhancement of its expressive power―while a collection of XML documents as a set of ground expressions, each describing an XML element in the documents. Axioms and relationships among elements in the collection as well as structural and integrity constraints are formalized as XML clauses. An XML database, consisting of: (ⅰ) a document collection (or an extensional database), (ⅱ) a set of axioms and relationships (or an intensional database), (ⅲ) a set of integrity constraints, is therefore modeled as an XML declarative description comprising a set of ground XML expressions and XML clauses. Its semantics is a set of ground XML expressions, which are explicitly described by the extensional database or implicitly derived from the database, based on the defined intensional database, and satisfy all the specified set of constraints. Thus, selective and complex queries, formulated as sets of XML clauses, about information satisfying specific criteria and possibly implicit in the database, become expressible and computable. The model thereby serves as an effective and well-founded XML database management framework with succinct representational and operational uniformity, reasoning capabilities as well as complex and deductive query supports.
机译：在提议的XML数据库数据模型中，XML元素直接表示为基本（无变量）XML表达式-通过合并变量以表示隐式信息并增强其表达能力来对XML元素进行泛化，而XML文档的集合，作为一组基础表达式，每个基础表达式描述文档中的XML元素。集合中元素之间的公理和关系以及结构性和完整性约束被形式化为XML子句。因此，一个XML数据库被建模为一个XML数据库，该数据库包括：（ⅰ）文档集合（或扩展数据库），（ⅱ）一组公理和关系（或内涵数据库），（ⅲ）一组完整性约束。 XML声明性描述，包含一组基础XML表达式和XML子句。它的语义是一组基础XML表达式，这些XML表达式由扩展数据库显式描述或从数据库隐式派生（基于定义的内涵数据库），并满足所有指定的约束集。因此，关于满足特定条件并且可能隐含在数据库中的信息的选择性和复杂查询（由XML子句集构成）变得可表达和可计算。因此，该模型可作为有效且基础良好的XML数据库管理框架，具有简洁的表示和操作统一性，推理功能以及复杂的演绎查询支持。

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